Fuel-economizer.



I l"UNITED srArEs PATENT OEEIOE.

WILLIAM cOLE, lOE NORFOLK, vIEeINL/i.l l

' FuEL-EGONOMIZER. i

Specification of Letters Patent. i Patented March 20, 1906.

Application filed September 1,1994. Serial No. 223,015.

. naces andthe doors thereof; and the objects of my invention are to provide simple and inexpensive means to economizefuel burned in said furnaces and improve its combustion by means of hot air or hot air and steam forced through the door into the furnace through an injector and a flexible lconnection attached to the source of supply and to the door. vI attain these objects by thev construction illustrated in the accompanying drawings, in which-- Figure 1 isa perspective view of a boilerfurnace having its doors provided with inj ectors and flexible connections leading from the steampressure supply in. yaccordance with my invention. Fig. 2'is aside view vof an injector secured to a portion ofthe iiredoor shown with its lininginner plate in section.l Fig. 3'. is a front view of aportion of the lining of the fire-door. Fig. 4 is a vertical section of the fire-door carryingl the linjector and its inner plate. Fig. 5 is a modification in which the injector is placed close to the regulating-valve of thedevice. l

In said drawings the numeral 2 indicates theA front plate of the furnace, to which are hinged the ash-pit doors 3v and the Ere-doors 5. The steam-dome of the boiler is shown at 5, from which issues the steam-pipe 6, having thereon aclosing-valve 7. On the vertical portion of the-pipe 6 below the valve 7 there are two branch pipes 8, having on their ends an elbow and a pendent flexible pi e 9,

, 4preferably of rubber. "Ihe lower end o said pipe is secured to a suitable injector 10 by means of its `end nipple 10a, saidinjector having on one side a leading-in passage 10b for The tubular inner endb of the injector is screw-threaded and made to enter the lire-door 4, which is recessed and carries an inner plate 4a,lsuitably bolted or lotherwise-secured tothe fire-door 4. The

plate 4a has a flange on the t'op and sides, but

' is ilangeless atthe bottom '.to constitute an air-heating chamber between the parts 4 and 4EL vand a long but narrow opening atjthe bot- In testimony whereof I affix tom for the escape of heated air into the furnace-chamber and over the burning fuel. The

inner plate 4a of the dooris preferably provided with pins or lugs 4D integral therewith, which are arrangedlin a staggered order and made to project internally to increase the airheating capacity of the plate 4a from the rap diating heat of the-fire..

In Fig. 5 the injector l10 is placed at a short distance below the opening Aand closing valve and leads the mixture of air and steam into the T-joint of the two branch pipes 8, which' carry, as before described, the pendent flexible pipes 9, the lower ends of which can be connected directly by means of screw-nipples'with the doors 4. The stem of the valve 7 is provided with side arms 7 a to operate it, and the latter have endent chains 7 b ,which can be extendedl wit 'n easy reach of the fireman to close the valve a fewminutes after fresh coal put in the furnace is burning brightly or at least' before he opens the furnace door; but he should open the valve again immediately 'after closing the door.

Having now fully described my invention,

" I claim- 1. In combination with the frontof a steam-boiler furnace, andthe steam-drum of a boiler, the rearwardly-recessed fire-door 4, hinged to said front, and the inner plate 4, of said door having flanges on its top and sides, a steam-pipe to lead steam forward of .said door, a valve thereon, a flexible pipe vleading from the steam-pipe to the Jre-door,

and an injector intermediate of the boiler andthe fire-door, substantially as described.

2. In` combination with the front of a steam-boiler furnace, and the steam-drum of a boiler, the nre-door 4, hinged to said front, a steam-pipe to lead steam toward said front, a valve thereon, a flexible connection leading fromvthe steam-pi e to the fire-door, and an injector intermediate of the valve and the fire-door 4, said door consisting of, a plate `flanged inwardly `all around and the inner plate 4a' having flanges on the top and sides butv a flangeless bottom, substantially as shown and described.-

my signature witnesses.

, WILLIAM E. COLE. 'Witnesseszv E. E. MASSON,- HAERY L. AMER.

in presence of two IOO 

